Psoriasis and ringworm are very different conditions. Ringworm is a fungal infection that will go away with treatment. Psoriasis is a chronic autoimmune condition that comes and goes throughout a person's life.

What skin conditions can be mistaken for ringworm?

Other conditions that occasionally look like ringworm include seborrhea, psoriasis, pityriasis, contact dermatitis (such as poison oak), drug reactions, tinea versicolor, vitiligo, erythema migrans (a rash seen in Lyme disease), and even lupus.

How can you tell the difference between fungal and psoriasis?

Psoriasis is an autoimmune disease that causes plaques and lesions on the skin. When symptoms develop on toenails and fingernails, they can resemble nail fungus. However, fungal infections are contagious, and psoriasis is not. The autoimmune activity in psoriasis causes the rapid overgrowth of skin cells.