Red spots growing in the triangle of the belly without pain or itching may be hyperpigmentation and may also be allergic purpura, which needs to be improved by medication as well as physical therapy. 1. Hyperpigmentation: If the patient has had eczema, urticaria and other skin diseases on the stomach, after scratching, the local broken, after the recovery of the condition, the local pigmentation is left, there may be a painless red spot on the stomach, which is a normal phenomenon, and generally do not need to do too much treatment, if the patient feels that it affects the aesthetics, it can also be removed through the laser surgery. The pigmentation under the skin can be removed. 2. Allergic purpura: It is also called hemorrhagic capillary toxicity, which is a kind of perverse reaction produced by the patient for some kind of sensitizing substances, which may lead to the rupture of subcutaneous capillaries, and make the patient’s skin or mucous membranes appear under the bruise point or bruise spot, which may be purplish-red or dark purple, and there may be painless and itchy erythema, and the patient may be given medicines such as cloridine tablets, vitamin C tablets, and so on, under the direction of the doctor. C, vitamin C tablets and other medications under the guidance of a doctor. Erythema in the triangle of the abdomen is painless and itchy, can actively consult the doctor and follow the doctor’s instructions for reasonable treatment.