A shingles rash usually stays on one side of the body. Bites on your ankles I'm guessing you already ruled out mosquitoes, fire ants, flea bites?....I would change laundry detergent to a hypo allergenic type if possible wash all bed clothes. I have a history of shingles but thankfully with none of the residual effects. But, I do as you say get random insect bite bumps sometimes, I just put some caladryl clear itch medicine on them and try to forget about them....I dont think I helped very much but I would suggest for sure wash all your bed linen take a shower before bed and use a mild body lotion and go to your doctor or a dermatologist for a more accurate dx if this persists. Have they suggested you get the shingles shot? Have a great day I hope.