Dilated Blood Vessels and Scalp pain
Trichodynia refers to hair pain. There are many potential causes of trichodynia. A study by Willimann and Trueb (in 2002) showed that dilated blood vessels seen in the scalp were strongly associated with trichodynia.
Reference
Willimann B, et al. Hair pain (trichodynia): frequency and relationship to hair loss and patient gender. Dermatology. 2002
This article was written by Dr. Jeff Donovan, a Canadian and US board certified dermatologist specializing exclusively in hair loss.