Common causes of small bumps on the skin include follicular keratosis pilaris, acne, milia, common warts and other diseases.
1. Keratosis Pilaris: This disease is mostly genetically related and manifests itself as brown, firm, rough papules on the skin covered with greasy scabs and other symptoms.
2. Acne: Acne is mainly caused by the interaction of high androgen levels, heredity, exuberant secretion of sebaceous glands, keratinization of perifollicular cells, inflammation, etc. It manifests itself in the form of pimples, papules, pustules, nodules, cysts, and scarring in the areas of seborrheic overflow.
3. Corns: usually the cause of primary corns is unknown, secondary corns can be caused by skin trauma, cosmetic treatment, blistering dermatosis, medication and other factors, manifested as yellowish-white, firm pimples or edematous plaques with multiple pimples on the skin and other symptoms.
4. common warts: this disease is mainly direct or indirect contact with the human papilloma virus, infection of human skin or mucous membranes caused by the performance of the skin pimples, warts on the surface of the dry, rough and uneven, skin color, gray, light brown or dirty brown and other symptoms.