There is a bag on the glans that looks like a mosquito bite, which may be insect bite dermatitis, tortoise head inflammation, warts, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Insect bite dermatitis: a localized skin allergic and inflammatory reaction that occurs after the skin is bitten by an insect, manifested as a sudden onset of pea- to fingertip-sized doughnut erythema, often with a huge itch. 2. glans: mainly consider candida glans, common manifestation of the glans surface with red pimples, there will also be the inner plate of the foreskin or the coronal groove of the white cheese-like patches, and even accompanied by pustular herpes and vesicles, mucus or pus-like secretion. 3. warts: after infection with human papillomavirus, may appear glans localized small packets, at first the volume is small, and after the volume can gradually increase, the surface is not smooth, the formation of papillomavirus or cauliflower pattern superfluous organisms. However, it is not ruled out that it is caused by other factors, it is recommended that the patient timely consultation, by the doctor to clarify the cause of the disease, to give targeted treatment.