Types of Psoriasis

Psoriatic arthritis develops in up to 30% of people with psoriasis, often years after skin symptoms appear. Without treatment, it can cause permanent, irreversible joint damage. Recognizing the early signs and getting a rheumatology assessment promptly is one of the most important steps a person with psoriasis can take.

Nail psoriasis is one of the most frequently misdiagnosed manifestations of psoriasis — often mistaken for a fungal infection for years. It affects up to 50% of people with skin psoriasis and up to 80% of those with psoriatic arthritis. This guide explains the signs, the diagnostic process, and what treatment options are available.

Inverse psoriasis affects the skin folds — areas where moisture and friction make psoriasis harder to manage and easier to misdiagnose. Unlike plaque psoriasis, it produces smooth, shiny, intensely red patches rather than scaly plaques. This guide covers what causes it, how to recognize it, and which treatments work best for these sensitive locations.

Psoriasis isn't one condition — it's eight. This guide covers every type: what it looks like, where it appears, who gets it, and what care looks like. Includes a quick-reference comparison table and links to deep-dive articles on each type.