This is a persistent, scaly plaque of SCC in situ, unlike the acute, bright red, moist infection of perianal strep.
Perianal candidiasis is distinguished by its beefy-red color and the presence of satellite pustules.
Perianal eczema is typically less well-demarcated and more scaly or weepy than the uniform, bright red erythema of a strep infection.
This is a persistent, eczematous-appearing plaque that is unresponsive to therapy, representing an underlying adenocarcinoma.
This is a thickened, leathery plaque from chronic scratching, not an acute, bright red infection.
This is the symptom of itching, which can be caused by a strep infection, not a differential diagnosis of the appearance.
Inverse psoriasis in this area is a sharply demarcated red plaque, but it is typically not as moist or tender as a strep infection and is chronic.
This would be less intensely erythematous and have a more yellowish, greasy scale.
A fungal infection here would have a scaly, advancing border and be confirmed by a KOH test.
This is characterized by atrophic, porcelain-white plaques, a completely different appearance.
