Hello,
Has the diagnosis of CIMICIDS (bed bugs) been verified by a doctor? Feel free to send photographs of the bites you have over the wrist or tattoo for opinion (www.bit.ly/drdariushsaghafi).
Typically, treatment of the bites themselves is purely symptomatic such as the use of antihistamines, oatmeal baths, OTC
steroid cream for just a few days in order to reduce pain, itching, and swelling.
Cool compresses can also be useful. The actual treatment is to eradicate the critters from your friend's house and for you not to stay in that environment until they've so.
They will have to likely call a professional extermination service to make sure the house is clear and free of this parasites otherwise, the problem will never go away.
Here is an image of what BED BUG bites look like. Are these what you've got?
https://images.medicinenet.com/images/appictures/bedbugs-s6-symptoms-signs-bites.jpg
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Dariush Saghafi, Neurologist