Pigmentation on the skin of the groin and inner thighs

Introduction Pigmentation in the skin of the groin and inner thigh is a pigmentation spot left after the femoral hernia. It gradually decreases with time, and no special treatment is needed.

Cause

(1) Causes of the disease

The main pathogens of the femoral hernia are Trichophyton rubrum and Trichophyton mentagrophytes. Flocculous epidermis has been a common pathogen of femoral hernia in the past, but it has been less in recent years. Other pathogens that can cause body lice can also become the cause of femoral hernia, but the proportion is small. Chinese medicine believes that sweating for a long time, caused by external wind and evil.

(two) pathogenesis

Since the thigh is more suitable for fungal growth, the incidence of femoral hernia is relatively high. In addition, the skin of this part is thin and tender, and Trichophyton rubrum and Trichophyton mentagrophytes are suitable for thigh growth. Airtight clothing increases the temperature and humidity of the skin and interferes with the barrier function of the stratum corneum. Trichophyton rubrum and Trichophyton mentagrophyta enter the skin and go through several stages of development, including incubation, growth and degeneration during the anti-infective process. The incubation period is in the stratum corneum and the clinical manifestations are mild. Once the infection is established, the growth rate of T. rubrum and T. rubrum and the rate of epidermal renewal are two key factors for the development of damage. The former must be equal or the former is greater than the latter, otherwise the number of Trichophyton and Trichophyton rubrum will decrease. The keratinase and other proteolytic enzymes produced by Trichophyton rubrum and Trichophyton mentagrote not only colonize and invade the skin, but also manifest as skin damage.

an examination

Related inspection

Skin color skin smear microscopy physical examination of skin diseases

Generally speaking, as a direct microscopic examination of the falling debris, the small scales at the edge of the lesion are taken, placed on a glass slide, and a little potassium hydroxide solution is dropped to dissolve the keratin protein, and then placed under a microscope to observe whether there is fungus. Hyphae, you can confirm the diagnosis. Of course, if conditions permit, a more definitive diagnosis can be made based on the culture of the fungus.

Differential diagnosis

Differential diagnosis of pigmentation in the groin and inner thigh skin:

1, seborrheic dermatitis: sometimes can also invade the genital area, the rash is pale red spots, there is desquamation, some are ring-shaped, the boundary is clear, but the direct microscopic examination of fungi is negative.

2, red sputum: skin disease caused by a coryneform bacillus, common in the armpits, thighs, etc., the skin of the lesion is brick red, no inflammatory ring at the edge, no itching, direct microscopic examination of fungi is negative. Psoriasis: Commonly known as psoriasis, it can invade the thigh, showing ring-shaped or plaque-like erythema. Generally, the surface has thick scaly, and other parts of the body can have the same rash.

3, scrotal eczema and dermatitis: skin lesions with moss or eczema-like changes, the edge is unclear, the center has no self-healing tendency, itch feeling is significant, the development of skin lesions and the season is not very close. It should be noted that the femoral hernia is prone to eczema-like changes after intense rubbing, hot water scalding or topical irritant drugs. The course of the disease is repeated and it is more difficult to treat.

Generally speaking, as a direct microscopic examination of the falling debris, the small scales at the edge of the lesion are taken, placed on a glass slide, and a little potassium hydroxide solution is dropped to dissolve the keratin protein, and then placed under a microscope to observe whether there is fungus. Hyphae, you can confirm the diagnosis. Of course, if conditions permit, a more definitive diagnosis can be made based on the culture of the fungus.

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