Feeling chill sensation in penis tip.

Good day, I feel cold/chillness sensation on my tip of penis rarely. Urine and Std tests are all normal. I take meds for angular stomatitis (cured) and Matilda forte for penis numbness recently which happens very rarely if I sit in a legs crossed position for long time(now it's getting better). So I'm constantly feeling irritated by this chillness feeling and I can't seem to put it in words to describe clearly to my general physician. Although when I drink a glass or 2 of water/wash the area with warm water when this feeling arises it gets better or goes away (not sure ). My theory is that I started getting this feeling after starting meds for a very minor skin infection from a dermatologist and had to abruptly stop it as it was showing some effects and the dermatologist just told me to drink lot of water as a remedy and I never had this chillness feeling before. Kindly help me out in finding what's causing it. Thank You.