Plaque psoriasis
The most common form of psoriasis, causing dry skin lesions covered in scales, known as plaques, often on your elbows, knees, scalp and lower back. These plaques can be sore and itchy.
Scalp psoriasis
A type of plaque psoriasis, it can occur on parts of your scalp or on your entire scalp, causing patches of skin covered in thick scales. While you may find scalp psoriasis incredibly itchy, it doesn’t always cause discomfort. In acute cases it can cause you to lose some of your hair, though this is usually temporary.
Nail psoriasis
Half of all people with psoriasis will find that the condition affects their nails, causing them to discolour, develop tiny dents, or to grow abnormally. Nails might separate from the nail bed, or less commonly, may deteriorate.
Guttate psoriasis
Guttate psoriasis causes small tear-shaped sores to develop on your chest, arms, legs and scalp. Often guttate psoriasis will disappear altogether after a few weeks, but some people do develop plaque psoriasis. This type of psoriasis sometimes occurs after a streptococcal throat infection. Antibiotics might be recommended to treat the infection.
Inverse (flexural) psoriasis
This affects the creases of your skin, such as your groin, armpits, and between your buttocks. It can cause smooth patches of skin to develop in any or all of these areas.
Sweating and friction can aggravate the symptoms of inverse psoriasis, so it can be more uncomfortable in hot weather.