Hello --
Pityriasis lichenoides is a fairly rare disease, but not terribly dangerous, just very annoying for the most part. It may be caused by the Epstein-Barr virus (as with mono), but there are a number of other suspects as well. It can take a more debilitating course, with
fever and ill-feeling, but also often is confined to a chronic, milder course that comes and goes.
There are a large number of potential therapies for it, as you've already discovered, but this is largely a trial-and-error process, and sometimes it takes a while to find which ones are effective for a given patient. Oral tetracycline and erythromycin have been used most often, but hydrocortisone cream and various other combinations of tetracycline, azithromycin, erythromycin, sulfonamides, dapsone, chloroquine, streptomycin, isoniazid, penicillin,
methotrexate (MTX), etretinate, and pentoxifylline are often tried, with varying results. It's a pretty annoying process, but generally some combination of these will work. It just takes a lot of patience while finding the right combo for you.
I hope this is helpful to you. Please follow up with us here as needed, and keep us updated as to your progress. Best of luck to you.
