What Are the Most Common Causes of Groin Rashes?

Prurigo is a general term for acute or chronic inflammatory skin diseases. It includes a group of pruritic diseases with similar skin lesions. endure. Prurigo is named differently and there is no consistent classification. Due to different clinical manifestations, prurigo is called pimples urticaria, prurigo pediatric, prurigo vulgaris, prurigo nodules, prurigo pregnancy and so on.

Basic Information

English name: prurigo
Visiting department: dermatology

Common locations: Limb extension
Common causes: Unexplained, may be related to hypersensitivity
Common symptoms: Wind-like papules, nodules, and secondary rashes, itchy

Causes of prurigo

The cause of this disease is unknown. Most scholars believe that it is related to hypersensitivity, and may also be related to neuropsychological factors, genetic allergies, and other factors such as insect bites, food or drug-induced focal infections, gastrointestinal dysfunction, pregnancy and endocrine disorders. Etc. often has an impact.

Clinical manifestations of prurigo

Pimples urticaria

Also known as acute simple prurigo, baby moss, and urticaria-like moss, due to allergic reactions caused by insect bites, they usually occur in spring, summer, and autumn. The rash is a prismatic wind mass or papules, with a short course and no lymphadenopathy. .

2. Pediatric prurigo (hebra prurigo, early-onset prurigo, mild prurigo)

Most often onset in childhood, the skin lesions are mainly red pimples, millet to mung bean size, and can also be wind mass or pimples-like urticaria-like rash. Later becomes arc nodular papules or small nodule damage. Scratches, blood scabs, or eczema-like changes can occur due to scratching. Extremities of the extremities are common, but can occur on the back, head and face. The subjective symptoms are intense itching, and pigmentation remains after the rash subsides. It can also occur repeatedly. A few patients continue into adulthood. Axillary and groin lymph nodes can become swollen.

3. Prurigo vulgaris (simple prurigo)

It is more common in middle-aged men and women. The damage is isolated round pimples, the size of mung beans to peas, there are tiny blisters on the top of the pimples, and serous crusts remain on the surface after the blisters. Scratching, lichenification, and pigmentation can occur, and a few cases leave a little scar after healing. The rash often occurs on the extremities of the extremities and on the trunk and hips. The damage disappears naturally in the short term but sometimes recurs.

4. Nodular prurigo (wart-shaped refractory urticaria)

The lesions are light red or red pimples at first, and soon become dome-shaped solid nodules, ranging from peas to nail size, usually gray-brown or red-brown. The damaged surface is keratinized, rough and wart-like, with a solid feel when touched. Consciously severe itching, which can subside on its own and leave pigmentation or scarring. It can also cause hemorrhoids, scratches, and lichenification on the top of the nodule due to scratching. Damage often occurs in the extremities, especially the lower leg extension, and can also occur in the back or other parts. Nodules tend to line up along the limbs. This disease is more common in adults, with women as the majority.

5. Prurigo pregnancy

Often in women with a second pregnancy, damage occurs in the first 3 to 4 months of pregnancy, or in the last two months of pregnancy. Usually disappears 3 to 4 weeks after delivery. Occurs in the upper trunk and proximal extremities. The basic rash is a severely itchy wind-like papules, sometimes pimples. After scratching, there may be changes such as scratches, scratches, hemorrhoids, and pigmentation.

Prurigo Exam

Pathological examination: mild hyperkeratosis and hypokeratosis of the epidermis, spinous layer hypertrophy, spongy formation and small blister occasionally, edema of connective tissue in the upper dermis, and lymphocyte infiltration around blood vessels.

Prurigo Diagnosis

According to the rash, erythema, pimples, and nodule damage are mostly isolated and symmetrical. It often occurs that the extremities are extended, especially the upper limbs, with severe itching, which is not difficult to diagnose.

Differential diagnosis of prurigo

Herpes-like dermatitis

Although the rash is polymorphic, it is mainly blisters or bullae, with specific changes in histopathology.

2. Verrucous lichen planus

The rash is a wart-like thickened plaque with a rough surface and bran-like scales. Histopathology is characterized by lichen planus and neurodermatitis.

Prurigo Treatment

At present, there is no ideal method for treatment, especially the cure is difficult. The most effective method is to find and eliminate the pathogenic factors. In daily life, pay attention to prevent insect bites, avoid scratching the affected area strongly, do not use hot water for washing, and do not abuse and stimulate strong external drugs.

Local treatment

It mainly treats itching and anti-inflammatory, such as calamine lotion and various glucocorticoid preparations.

2. Systemic treatment

(1) For anti-allergic treatment, two or more antihistamines can be used in combination or alternately, supplemented by vitamin C, calcium and sodium thiosulfate intravenously.

(2) For prone rashes and severe itching, procaine veins can also be used for closure.

(3) For patients with neuropsychiatric factors, sedative and hypnotic drugs can be appropriately given to inhibit nerve excitability, thereby alleviating symptoms, such as diazepam, once a night.

(4) For intractable cases, glucocorticoids such as prednisone can be used systemically for a short period of time, 3 times a day. After the symptoms are relieved, gradually reduce the dose to discontinuation.

3. physical therapy

Bran bath, starch bath, sulfur bath, and tar bath all reduce itching; for patients with intractable treatment, narrow-spectrum medium-wave UV treatment can be tried.