How Do I Recognize Pimples as an Allergic Reaction?

A papule is a localized, substantial elevation of the skin's surface, which may be due to the deposition of metabolites, limited proliferation of epidermal or dermal cell components, or infiltration of dermal localized cells. Pimples can occur in various parts of the human skin and are the most basic type of skin lesions. They are found in many different diseases.

Basic Information

English name: papule
Visiting department: dermatology
Common locations: skin
Common causes: Infections, physical injuries, allergies, autoimmune diseases, bullous skin diseases, vasculitis and vascular diseases, pimples, scaly skin diseases, etc.

Common symptoms: Above the skin, pointed, round, flat, or depressed in the center; round, polygonal, or irregular at the bottom; red, purple, yellow, or white with itching or pain

Causes of pimples and common diseases

There are various causes of pimples, and the main causes of pimples are rash.

1. Infectious diseases, common viral infections, such as common warts, condyloma acuminatum, molluscum contagiosum, etc .; bacterial diseases, such as skin tuberculosis, atypical mycobacterium infection, facial miliary lupus, etc .; fungal infections , Such as tinea corporis, erythematous papular candidiasis, Manefield basket disease, cryptococcosis, etc .; others are spirochaete infections.

2. Physical dermatoses, common are solar dermatitis, pimple, pleomorphic solar rash, corns, and frictional lichenoid rash.

3. Various allergic skin diseases, such as contact dermatitis, atopic dermatitis, papular urticaria and so on.

4. Autoimmune skin diseases and bullous skin diseases, such as lupus erythematosus, bullous pemphigoid, linear IgA bullous dermatosis and so on.

5. Vasculitis and vascular diseases, such as Behcet syndrome and eosinophilic vasculitis.

6. Pimples and scaly skin diseases. Psoriasis, red pityriasis, lichen planus, and linear moss are common.

7. Keratosis of the skin, common hair follicle keratosis, sweat keratosis, arsenic keratosis and so on.

8. Skin appendage diseases, such as acne, rose acne, occupational acne, etc.

9. Endocrine, metabolic and nutritional skin diseases, such as skin amyloidosis, porphyria, hair follicle mucin disease, xanthomatosis, etc.

10. Skin diseases of skin tumors, such as pigment nevus, seborrheic keratosis, keratoacanthoma, hair epithelioma, sebaceous nevus, soft fibroids, syringoma, mycosis fungoides, etc.

Clinical manifestations of pimples

Pimples appear as substantial damage above the skin. Its diameter is generally less than 0.5cm, and the larger is called a plaque.

The pimples vary in shape, the top can be pointed, round, flat, or recessed in the center; the base can be round, polygonal, or irregular. The color of pimples can also be red, purple, yellow, or white. There may be scales on some surfaces. The number of pimples can be single or many, and some are accompanied by conscious symptoms such as itching or pain. Some rashes are between maculopapular and pimples, called maculopapular; on the basis of pimples, there are blisters or pustules called pimples or pustular pimples.

Differential diagnosis of pimples

The differential diagnosis of pimples is mainly to distinguish infectious inflammatory pimples, non-infectious inflammatory pimples or tumorous pimples. Viral infections, bacterial infections, Treponema infections, fungal infections, or parasitic and insect-infected pimples in infectious inflammatory pimples; allergic, pimples-scale skin diseases, neurological factors, and vasculitis in non-infectious inflammatory pimples Skin disease, physical factors, or pimples caused by sebaceous glands.

Pimples check

1. Check for pimples

Note the color, shape, and location of the pimples. Whether the idea broke or whether the rash changed. Whether itching, burning or tenderness. Pay attention to associated symptoms and signs, such as fever, headache, and gastrointestinal discomfort.

2. Understand previous medical history

Including a history of allergies, whether skin diseases, infections, childhood diseases, sexually transmitted diseases, tumors. Recent mosquito bites or contact with infected patients. Learn about drug history.

3. Laboratory inspection

The total number of white blood cells in the pimples infected by the virus is low or normal. Can detect pathogenic microorganism DNA gene detection. Bacterially infected pimples are accompanied by fever, and blood neutrophils can increase. The pus culture was bacteriologically positive. Fungal pimples are examined under microscope and positive for fungal examination or culture. Syphilis papules can be tested positive for syphilis. Tuberculous pimples can be tested or cultured for tuberculin. Various pimples can be taken for biopsy if necessary to help diagnosis.