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Three years ago, lesions began appearing on this now 68-year-old woman’s legs. They have grown in size and number, and their roughness disturbs the patient. She has been told the lesions are related to aging, but she has never seen anything like them on her friends or family—and she is worried about what they might mean for her health.
Her primary care provider diagnosed warts and performed cryotherapy on several of the lesions. However, the pain was intolerable and the treatment ineffective. To add insult to injury, each treated spot blistered and took more than a month to heal, leaving behind a pinkish brown blemish.
In all other respects, the patient’s health is excellent.
EXAMINATION
Both legs, from the upper thighs to the tops of the feet, are covered with thousands of uniformly distributed, tiny, keratotic, rough, dry papules. All the lesions are essentially identical: white, with no associated signs of inflammation. The patient’s skin is quite dry in general. Neither her palms nor soles are affected.
What’s the diagnosis?
DISCUSSION
The most common problem seen in dermatology offices worldwide is seborrheic keratosis (SK), a totally benign epidermal excrescence that appears to be related to aging and heredity. Most patients are in their 50s when they first notice an SK, and with a bit of luck, they will only see a few in their lifetime. But some patients develop hundreds of SKs, many of which become quite large (3-5 cm) and unsightly. In certain circumstances, SKs can herald the arrival of an occult carcinoma (the Leser-Trelat sign).
This patient has what some consider a variant of SK, called stucco keratosis. These lesions manifest almost exclusively on the lower legs and feet—perhaps due to the relative lack of sebaceous glands in those areas—and most often on men older than 60. Distressing as they are, stucco keratoses have no pathologic implications.
Grossly and histologically, stucco keratoses are different from ordinary SKs. Each stucco keratosis lesion is essentially identical to the others, with a spiculated surface, white color, and average diameter of 2 to 3 mm. Histologically, they demonstrate a thickened epidermis with focal exophytic upward projections that resemble church spires. The lesions do not extend into the dermis.
Treatment of stucco keratoses is, at best, tedious, painful, and futile. The modalities used are cryotherapy or electrodessication with curettage. For a degree of comfort, use of a loofah after bathing will remove or smooth down a few lesions, but this process must be followed by application of a heavy emollient. Alas, regrowth is a certainty.
TAKE-HOME LEARNING POINTS
- Stucco keratosis is considered a variant of seborrheic keratosis, although they differ in several significant ways.
- The lesions of stucco keratosis are fairly uniform in appearance: white, rough, spiculated, epidermal papules measuring 2 to 3 mm.
- Stucco keratoses affect about 10% of the population (men more often than women) and have no racial predilection or pathologic implications.
- The lesions are found almost exclusively on the legs, from the knees down to and including the dorsa of the feet.
- Treatment is far from satisfactory, for multiple reasons, including resultant pain and scarring.
Three years ago, lesions began appearing on this now 68-year-old woman’s legs. They have grown in size and number, and their roughness disturbs the patient. She has been told the lesions are related to aging, but she has never seen anything like them on her friends or family—and she is worried about what they might mean for her health.
Her primary care provider diagnosed warts and performed cryotherapy on several of the lesions. However, the pain was intolerable and the treatment ineffective. To add insult to injury, each treated spot blistered and took more than a month to heal, leaving behind a pinkish brown blemish.
In all other respects, the patient’s health is excellent.
EXAMINATION
Both legs, from the upper thighs to the tops of the feet, are covered with thousands of uniformly distributed, tiny, keratotic, rough, dry papules. All the lesions are essentially identical: white, with no associated signs of inflammation. The patient’s skin is quite dry in general. Neither her palms nor soles are affected.
What’s the diagnosis?
DISCUSSION
The most common problem seen in dermatology offices worldwide is seborrheic keratosis (SK), a totally benign epidermal excrescence that appears to be related to aging and heredity. Most patients are in their 50s when they first notice an SK, and with a bit of luck, they will only see a few in their lifetime. But some patients develop hundreds of SKs, many of which become quite large (3-5 cm) and unsightly. In certain circumstances, SKs can herald the arrival of an occult carcinoma (the Leser-Trelat sign).
This patient has what some consider a variant of SK, called stucco keratosis. These lesions manifest almost exclusively on the lower legs and feet—perhaps due to the relative lack of sebaceous glands in those areas—and most often on men older than 60. Distressing as they are, stucco keratoses have no pathologic implications.
Grossly and histologically, stucco keratoses are different from ordinary SKs. Each stucco keratosis lesion is essentially identical to the others, with a spiculated surface, white color, and average diameter of 2 to 3 mm. Histologically, they demonstrate a thickened epidermis with focal exophytic upward projections that resemble church spires. The lesions do not extend into the dermis.
Treatment of stucco keratoses is, at best, tedious, painful, and futile. The modalities used are cryotherapy or electrodessication with curettage. For a degree of comfort, use of a loofah after bathing will remove or smooth down a few lesions, but this process must be followed by application of a heavy emollient. Alas, regrowth is a certainty.
TAKE-HOME LEARNING POINTS
- Stucco keratosis is considered a variant of seborrheic keratosis, although they differ in several significant ways.
- The lesions of stucco keratosis are fairly uniform in appearance: white, rough, spiculated, epidermal papules measuring 2 to 3 mm.
- Stucco keratoses affect about 10% of the population (men more often than women) and have no racial predilection or pathologic implications.
- The lesions are found almost exclusively on the legs, from the knees down to and including the dorsa of the feet.
- Treatment is far from satisfactory, for multiple reasons, including resultant pain and scarring.
Three years ago, lesions began appearing on this now 68-year-old woman’s legs. They have grown in size and number, and their roughness disturbs the patient. She has been told the lesions are related to aging, but she has never seen anything like them on her friends or family—and she is worried about what they might mean for her health.
Her primary care provider diagnosed warts and performed cryotherapy on several of the lesions. However, the pain was intolerable and the treatment ineffective. To add insult to injury, each treated spot blistered and took more than a month to heal, leaving behind a pinkish brown blemish.
In all other respects, the patient’s health is excellent.
EXAMINATION
Both legs, from the upper thighs to the tops of the feet, are covered with thousands of uniformly distributed, tiny, keratotic, rough, dry papules. All the lesions are essentially identical: white, with no associated signs of inflammation. The patient’s skin is quite dry in general. Neither her palms nor soles are affected.
What’s the diagnosis?
DISCUSSION
The most common problem seen in dermatology offices worldwide is seborrheic keratosis (SK), a totally benign epidermal excrescence that appears to be related to aging and heredity. Most patients are in their 50s when they first notice an SK, and with a bit of luck, they will only see a few in their lifetime. But some patients develop hundreds of SKs, many of which become quite large (3-5 cm) and unsightly. In certain circumstances, SKs can herald the arrival of an occult carcinoma (the Leser-Trelat sign).
This patient has what some consider a variant of SK, called stucco keratosis. These lesions manifest almost exclusively on the lower legs and feet—perhaps due to the relative lack of sebaceous glands in those areas—and most often on men older than 60. Distressing as they are, stucco keratoses have no pathologic implications.
Grossly and histologically, stucco keratoses are different from ordinary SKs. Each stucco keratosis lesion is essentially identical to the others, with a spiculated surface, white color, and average diameter of 2 to 3 mm. Histologically, they demonstrate a thickened epidermis with focal exophytic upward projections that resemble church spires. The lesions do not extend into the dermis.
Treatment of stucco keratoses is, at best, tedious, painful, and futile. The modalities used are cryotherapy or electrodessication with curettage. For a degree of comfort, use of a loofah after bathing will remove or smooth down a few lesions, but this process must be followed by application of a heavy emollient. Alas, regrowth is a certainty.
TAKE-HOME LEARNING POINTS
- Stucco keratosis is considered a variant of seborrheic keratosis, although they differ in several significant ways.
- The lesions of stucco keratosis are fairly uniform in appearance: white, rough, spiculated, epidermal papules measuring 2 to 3 mm.
- Stucco keratoses affect about 10% of the population (men more often than women) and have no racial predilection or pathologic implications.
- The lesions are found almost exclusively on the legs, from the knees down to and including the dorsa of the feet.
- Treatment is far from satisfactory, for multiple reasons, including resultant pain and scarring.
