Lower doses of a common antibiotic can curb hair loss caused by a rare skin condition, a new study says. The antibiotic doxycycline is commonly used to treat lymphocytic scarring alopecia, a condition in which the body's immune cells target hair follicles, researchers said. Advertisement But the relatively high doses of doxycycline used to prevent hair loss and scarring aren't necessary, according to findings published Tuesday in the Journal of the American Academy of Dermatology . That means