What are these bumps on my skin ..are these an sign of std or normal

[nh_user_1428459]

These bumps appears on thighs ....my back...and now even on forehead....in pair of three( not always) ...they occur individually also....i feel tingling and itching when they r about to occur at that area...

[nh_user_1441309]

i have seen them before does anyone know what it is?