1, trichomonas glansitis or eczema: this condition is mostly seen in patients with long foreskin, mainly manifested as red spots or flaky erosion on the glans surface, accompanied by a little yellowish-white discharge, accompanied by itchy feeling, improve after cleaning. This is the first time that a person has a history of trichomonas vaginalis, so the couple should be treated together. 2, erosive foreskin or allergic foreskin: This type of patient is mainly in the foreskin inflammation after taking medication for a long time but does not heal, so suddenly suspicious. In fact, this part of the patient infection before the history of local abrasions or medication history, such as genital herpes due to itching and scratching themselves to break, can be secondary to mycobacterial infection; people with sulfonamide allergies can be due to medication to foreskin or glans allergic inflammation, this type of patients using antibacterial treatment is ineffective, plus some people self-administered PP solution for external use, but also because the concentration is too large and aggravate the inflammatory erosion. This situation will quickly heal itself as long as the treatment plan is corrected, and patients with similar conditions can try anti-viral, anti-mycotic or fungal, anti-allergy and other medications. 3, the coronal nerve papilla abnormal hyperplasia: This part of the patient more than inadvertently found their “abnormal symptoms” and suspicion, in their own review of the relevant books will be self-diagnosed as “condyloma acuminata”, and fear a lot. This is a nerve sensory “device” containing a wealth of nerve endings, and its special structure also demonstrates its special role. There are many patients who are ignorant and privately laser cauterize the last leading to a decline in sexual feelings and regret, suffering. 4, allergic lesions: some people take sulfonamide or antipyretic drugs, external genital skin can appear one to several round or oval erythema, generally not painful, no itch, after stopping the drug can subside, which is manifested as a fixed erythema drug allergic reaction; some people take some drugs or food, can cause glans foreskin edema, after stopping the drug or food, edema can gradually subside; some people external genital contact When irritating drugs, or contraceptives or diapers and paints, local erythema, papules, blisters, vesicles or ulcers can appear, which is called contact allergic dermatitis, can be cured after lifting the contact and appropriate treatment. 5, traumatic lesions: when insect stings external genitalia, can cause redness and blisters; if rough sex, can also occur external genitalia abrasions and hematomas; some people after sexual intercourse, can be due to temporary blockage of the lymphatic vessels, causing the penis back or coronal groove cartilage-like hard cords, medically known as penile sclerosing lymphitis, generally disappear after a few weeks; some people because the foreskin is too long, flip can not be reset, resulting in foreskin and The end of the penis is severely edematous, which is called embedded prepuce, to timely surgical treatment. 6, non-STD infections: staphylococcal infection can cause external genital folliculitis, boils or sweat glanditis, etc.; unclean sexual intercourse can cause foreskin bacillus erosion glansitis, but also can cause amoebic glansitis, tuberculosis sores, filariasis, etc. In normal women, the lower part of the genitalia of the rotten matter parasitic coarse bacillus, in low resistance, can cause acute female genital ulcers. 7, benign tumors and superfluous organisms: external genital area can also see some slow development, persistent black, yellow, red or skin-colored papules or nodules, they may be pearly penile papulosis, milia, pigmented nevus, superficial lipoma-like nevus, vestibular gland cyst, sebaceous gland cyst, multiple lipodystrophies, lipoma, hemangioma and fibroma, etc. 8. Precancerous lesions and malignant tumors: White spots and hypertrophic erythema occurring on the external genitalia, especially when they are keratinized, rough, desquamated, wart-like hyperplasia and stubborn ulcers, may be precancerous diseases or malignant tumors, which require vigilance and timely diagnosis and treatment. Other skin diseases may occur on the external genitalia. Such as penile cavernous sclerosis, plasma cell glans, female pubic atrophy, penile dryness, lichen planus, eczema, seborrheic dermatitis, neurodermatitis, psoriasis, are not in the category of venereal disease. When a skin lesion occurs on the external genitalia, do not panic and never refrain from seeking medical attention. You should be promptly examined and treated to eliminate the psychological distress of STD phobia.