A pimple-like growth on the arm can be caused by a variety of reasons. If it appears unilaterally or asymmetrically, accompanied by itching and a small sunken hole in the middle of the pimple, it may be caused by a mosquito bite. If you’re looking for a good deal more than just a few of the most popular and popular products in the world, you’ll be able to find the right one for you. If the daily cleaning is not in place, it can easily lead to blockage of the skin pores of the arms, so that bacteria multiply and folliculitis occurs. The clinical manifestation is a red follicular papule, which may appear as a pustule in the center within a few days, surrounded by a red halo. Patients are mainly treated with topical medications, such as ichthyolite ointment, mupirocin ointment, etc.; 2. Boils: can be caused by Staphylococcus aureus infection and can be single or multiple, usually as papules and nodules the size of a soybean or larger, and may also cause swollen and painful axillary lymph if grown on the arm near the underarm area. In the early stage, when it is not yet broken, infrared light can be applied and mupirocin ointment and tincture of iodine can be applied. If the late pus and pus drainage is not smooth, may need to be incised pus drainage treatment; 3, perifollicular keratosis: is a chronic follicular keratosis dermatosis, mainly in the upper arm and thigh extension, symmetrical distribution, occasionally see the distribution of generalized, damaged skin will appear rough feeling, follicular papules. This disease can be topical topical vitamin A acid cream or salicylic acid ointment, can soften or dissolve the keratin, improve symptoms; 4, common warts: is caused by human papillomavirus infection of the skin mucosa benign redundancy, can occur in any part of the body, typical lesions for soybean size or larger gray-brown, brown, skin-colored papules, rough surface, hard texture, can be papillate, cauliflower-shaped. Topical treatment with vitamin A acid cream and imiquimod cream can be used, as well as physical therapy such as freezing, electrocautery and scraping; 5. Dermatitis: inflammatory skin reactions due to allergies and other factors, of many kinds, can lead to skin papules, manifesting as acne, which can be accompanied by itching and burning. Patients can use wet compresses to relieve itching and anti-inflammatory, together with oral antihistamines, such as cetirizine, loratadine, etc.