A sudden bulge on the arm may be caused by mosquito bites, folliculitis, sebaceous cysts and other reasons.
1. mosquito bites: when the arm area skin by mosquito bites, toxins injected into the skin will trigger a local allergic reaction, often redness, swelling, itching and other symptoms, can be used under the guidance of professionals, such as compound menthol ointment treatment.
2. Folliculitis: this is a bacterial or fungal infection of the hair follicles caused by infectious diseases, preferred in the sebaceous gland secretion of the parts, the patient in addition to the arm suddenly a bulging bag, but also accompanied by redness, swelling, itching, pain and other symptoms. A clear diagnosis is needed, and anti-fungal or anti-bacterial treatment should be given under the guidance of professionals.
3. Sebaceous cysts: Due to the blockage of the sebaceous gland ducts of the hair follicles in the skin, resulting in the accumulation of sebum and the formation of retention cysts, manifested as round, smooth surface, clear borders of the arm of the cystic bulge, feasible surgical excision.
The sudden appearance of a bulge on the arm may also be caused by boils, lipomas, etc. Patients should consult a doctor in time and choose targeted treatment according to the actual situation.