Other than mpb, what are some other differentials for diffuse midfrontal hair loss?

Some possibilities..: One's primary care doctor can check for medical causes. If none found, then one can see a dermatologist, especially one specializing in hair restoration (some treatments: minoxidil, finasteride, hair transplants,...). Medical causes may include: hormonal problems (low thyroid), seborrhea, alopecia areata, stressful illness. Other causes: genetic male/female pattern baldness, telogen effluvium,...