I agree with Soleil that a scalp massage is in order. Any time your head feels weird, better safe than sorry. Most people claim to get growth from the tingling, but because tingling could mean a lot of things to different people, those who've lost hair can tell you they felt a sensation that wasn't normal. Sometimes it's a soreness--which for some means growth spurt; sometimes it's increased sensitivity--so that when the wind blows you feel a tingle. Since massage is a good way to keep scalp supple and ensure you don't get that tight scalp that's typical of bald folks, just give yourself a good massage when you feel a tingle. If indeed you were having a growth spurt, then encourage it by increasing blood circulation. If it were an omen of follicles not feeling their best, then increased circulation will bring nourishment and oxygen that they might just have been lacking. You have nothing to lose by massaging.