Type 1

Minimal or no recession of the hair line.

Type 2

Triangular, usually symmetrical, areas of recession at the front temporal hair line.

Type 3

In this presentation, the hair loss is primarily from the vertex (where the two sides of the hair meet in the middle of the scalp), with limited recession of the front temporal hair line that does not exceed the degree of recession seen in Type II.

Type 4

The front temporal recession is more severe than in type III. There is sparse hair or no hair on the vertex. The two areas of hair loss are separated by a band of moderately dense hair that extends across the top. This band connects with the fully haired fringe on the sides of the scalp. Type IV is distinguished from type III vertex in which the loss is primarily from the vertex.