The possible causes of thinning eyebrows include baldness, seborrheic dermatitis, endocrine disorders, etc. Thinning eyebrows in men can be improved through medication and enhanced conditioning. 1. Pemphigus vulgaris: Pemphigus vulgaris is one of the common causes of hair loss, and more serious cases of pemphigus vulgaris may lead to loss of eyebrows, eyelashes and other hairs, resulting in total baldness, which can be treated by topical application of minoxidil to help eyebrow growth, or topical or local injection of glucocorticosteroids. 2. Seborrheic dermatitis: Seborrheic dermatitis may also lead to sparse male eyebrows, in addition to the two sides of the nose, scalp, eyebrows and other parts of the erythema, flaking, secretion scabs, etc., can be applied locally salicylic acid ointment, tacrolimus and other ointments to help treatment, while the patient should pay attention to do a good job of facial cleanliness and care, to help control the anti-inflammatory oil and reduce the follicle clogging. 3. Endocrine disorders: hypothyroidism, androgen insufficiency and other endocrine disorders related to diseases, may also lead to the phenomenon of male eyebrow scarcity, such patients through medication to help replenish the lack of hormones in the body, such as hypothyroidism, patients can take levothyroxine sodium tablets, thyroid tablets and other medications, androgen insufficiency patients can take testosterone propionate, androstanolone and other drugs. There may be other reasons for eyebrow thinning, it is recommended to consult a doctor in time, under the guidance of the doctor’s medication.