What diseases can cause thigh erythema?

Thigh erythema is a common symptom, which is mostly caused by fungal infection, also commonly called dermatophytes. Also known as tinea cruris, in addition to fungal causes, seborrheic dermatitis and erythrasma caused by Corynebacterium are also common. In addition, there is the more familiar psoriasis, which is also called psoriasis. All of them may cause such symptoms. You should go to the hospital for examination in time to determine the cause and treat it symptomatically.

1. Seborrheic dermatitis:

Sometimes it can also invade the pubic and femoral areas. The rash is light red spots with desquamation. Some are ring-shaped with clear borders, but direct microscopic examination for fungi is negative.

2. Erythrasma:

A skin disease caused by a rod-shaped bacillus, commonly found in the armpits, thighs, etc. The skin in the affected area is brick red, with no inflammatory ring at the edge and no itching. Direct microscopic examination of fungi is negative.

3. Psoriasis:

Commonly known as psoriasis, it can invade the thighs and manifest as annular or plaque-like erythema, generally with thicker scales on the surface. The same rash may also occur in other parts of the body.

4. Scrotal eczema and dermatitis:

The skin lesions are mainly lichenified or eczematous, with unclear edges, no tendency for the center to heal on its own, significant itching, and the development of the skin lesions is not closely related to the season. It should be noted that tinea cruris is prone to eczema-like changes after intense scratching, hot water washing or use of highly irritating topical medications. The course of the disease is protracted and recurrent, making it difficult to treat.

5. Vitamin B2 deficiency:

It is a syndrome of skin, scrotum and oral cavity caused by vitamin B2 (riboflavin) deficiency in the body. The main manifestation is scrotitis, which begins with diffuse pink patches on the scrotum with clear boundaries and slightly raised edges. The patches are covered with grayish white scales or thick brownish black crusts, and the scales are negative for bacteria. Glossitis and angular cheilitis are combined and tend to occur collectively in the same catering unit.