<s>[INST] Hi There! I am in bali and a few days ago notcies some red smallish bites on my arm . It was after i applied sunblock but i have never had an allergic reaction to this brand before. Three days later they are now down both arms and a little on my legs. Not to be seen on my torso or feet at all. They have become itchy and sore. I also have bumps under my skin on both my arms now too. They are redish but the bumps are more colourless and white. I don t usually suffer from skin reactions and have used dermaid ( a cortisone cream) as well as ice but neither have helped. Thanks for any info you can give me! [/INST] Hi, You may be having purity simplex. There are itchy erythematous popular lesions on extremities. It may be caused by some irritants or allergens.cosmetics,sunscreen, dust, insects, pollens, fume,deodorant, soap.avoid soap during bath, you can use detail liquid. Avoid stress and worried, which can exacerbate the disease. Antihistaminics like levocetirizine might improve the disease. Antibiotics may be taken, if there is infection. Steroids in tampering dose may be taken, if it is severe. Application of mild steroids might help in curing the disease. I hope you got my answer. Thanks. </s>