LONDON – Hardened feet are a major determinant of the clinical course of epidermolysis bullosa simplex (EBS), according to research presented by a German team of investigators at the EB World Congress.
In a study of 157 individuals with EBS, 75.8% had plantar keratoderma, a condition associated with a vicious circle of pain, reduced mobility, subsequent weight gain, and further foot problems.
“EBS has severe impacts on various aspects of everyday life,” Antonia Reimer, MD, and associates at the University of Freiburg, Germany, reported in a poster presentation. “Plantar involvement and [plantar keratoderma] are serious complications of all EBS subtypes, correlating with excessive weight gain, pain, local infections, and limited mobility.”
The researchers suggested that “targeting [plantar keratoderma] should be a priority in EBS therapy and research.”
In their retrospective cohort study, clinical and molecular data were retrieved from patient records, and major determinants of the clinical course of EBS investigated. As such, the researchers looked at how weight changes affected EBS, the effect of hardening skin on the feet, pain, mobility, and working life.
“EB simplex is generally regarded as the ‘mildest’ EB type,” Dr. Reimer and colleagues wrote, “however, individuals with EBS report a high disease burden and frequent pain.” The team found that just under 30% of patients (n = 46) experienced frequent pain, particularly those with localized and severe EBS. Of the patients experiencing pain, the majority (75.2%) had plantar keratoderma. Furthermore, those with blisters underneath the hardened skin reported having the most painful lesions.
Palmoplantar hyperhidrosis was present in slightly more than 40% of cases, and was especially common in individuals with localized EBS, Dr. Reimer and colleagues found. They also found that bacterial and fungal infections occurred in 14% and 7% of patients, respectively, and this correlated significantly with diffuse plantar keratoderma.
A third of patients experience mobility problems, and 8.2% required a wheelchair; 16.4% “were in occupational disability,” the team reported.
“Hyperkeratosis is important because it isn’t just about treating the hyperkeratosis, it’s also looking at the mechanical balance of the foot,” Tariq Khan, PhD, said during an unrelated oral presentation. Dr. Khan, a consultant podiatrist specializing in EB at Great Ormond Street Hospital NHS Foundation Trust in London, discussed how to best manage the feet of people with EB.
“Podiatry technology and how we treat can often be detrimental to an EB patient,” Dr. Khan cautioned at the meeting, which was organized by the Dystrophic Epidermolysis Bullosa Association (DEBRA).
For example, “certain devices, certain types of material, will add more friction and pressure and cause more blistering,” he added, making treatment challenging.