Testing is crucial to rule monkeypox in – or out
While monkeypox lesions can be confused for other diseases, Dr. Rosenbach said that a diagnosis can be confirmed through various tests. Varicella zoster virus (VZV) and herpes simplex virus (HSV) have distinct findings on Tzanck smears (nuclear molding, multinucleated cells), and have widely available fairly rapid tests (PCR, or in some places, DFA). “Staph and bacterial folliculitis can usually be cultured quickly,” he said. “If you have someone with no risk factors/exposure, and you test for VZV, HSV, folliculitis, and it’s negative – you should know within 24 hours in most places – then you can broaden your differential diagnosis and consider alternate explanations, including monkeypox.”
Quest Diagnostics and Labcorp, two of the largest commercial labs in the United States, are now offering monkeypox tests. Labcorp says its test has a 2- to 3-day turnaround time.
As for treatment, some physicians are prescribing off-label use of tecovirimat (also known as TPOXX or ST-246), a smallpox antiviral treatment. The CDC offers guidelines about its use. “It seems to work very fast, with patients improving in 24-72 hours,” Dr. Rosenbach said. However, “it is still very challenging to give and get. There’s a cumbersome system to prescribe it, and it needs to be shipped from the national stockpile. Dermatologists should be working with their state health department, infection control, and infectious disease doctors.”
It’s likely that dermatologists are not comfortable with the process to access the drug, he said, “but if we do not act quickly to control the current outbreak, we will all – unfortunately – need to learn to be comfortable prescribing it.”
In regard to pain control, an over-the-counter painkiller approach may be appropriate depending on comorbidities, Dr. Rosenbach said. “Some patients with very severe disease, such as perianal involvement and proctitis, have such severe pain they need to be hospitalized. This is less common.”
Recommendations pending on scarring prevention
There’s limited high-quality evidence about the prevention of scarring in diseases like monkeypox, Dr. Rosenbach noted. “Any recommendations are usually based on very small, limited, uncontrolled studies. In the case of monkeypox, truly we are off the edge of the map.”
He advises cleaning lesions with gentle soap and water – keeping in mind that contaminated towels may spread disease – and potentially using a topical ointment-based dressing such as a Vaseline/nonstick dressing or Vaseline-impregnated gauze. If there’s concern about superinfection, as can occur with staph infections, topical antibiotics such as mupirocin 2% ointment may be appropriate, he said.
“Some folks like to try silica gel sheets to prevent scarring,” Dr. Rosenbach said. “There’s not a lot of evidence to support that, but they’re unlikely to be harmful. I would personally consider them, but it really depends on the extent of disease, anatomic sites involved, and access to care.”
Emory University’s Dr. Yeung also suggested using silicone gel or sheets to optimize the scar appearance once the lesions have crusted over. “People have used lasers, microneedling, etc., to improve smallpox scar appearance,” he added, “and I’m sure dermatologists will be the ones to study what works best for treating monkeypox scars.”
As for the big picture, Dr. Yeung said that dermatologists are critical in the fight to control monkeypox: “We can help our colleagues and patients manage symptoms and wound care, advocate for vaccination and treatment, treat long-term scarring sequelae, and destigmatize LGBTQ health care.”
The dermatologists interviewed for this article report no disclosures.