Seborrheic alopecia, also known as androgenetic alopecia, can be differentiated and diagnosed by means of clinical manifestations, hair pulling test and dermoscopy.
1. Clinical manifestations: Androgenetic alopecia can be characterized by thinning of hair diameter, reduction of hair density, hair loss, usually accompanied by increased oil secretion from the scalp.
2. Hair pulling test: Pinch the patient’s 20~60 hair strands with fingers with medium strength, if more than 6 hairs are pulled out, it is a positive hair pulling test, which indicates active hair loss and can be considered androgenetic alopecia.
3. Dermoscopic examination: androgenetic alopecia dermoscopic features are uneven hair thickness, the difference in hair shaft diameter > 20%, the increase of cui hair or hair follicle units in the number of hair reduction.
In addition, it can also be combined with the patient whether there is a family history of androgenetic alopecia to determine whether the disease.
It is recommended that patients with seborrheic alopecia go to the hospital in a timely manner, under the guidance of the doctor’s standardized treatment, to avoid the delay of self-medication.