Yes, these sensations are completely normal and relevant and will pass in a few minutes. Our spot treatment products contain a very small amount of different AHA and BHA acids (milk, glycol and salicylic acid), which are active, safe and effective ingredients. The acids renew the skin and cell function, improve and repair the skin's structure, prevent and even out pigmentation disorders, exfoliate, shrink and deep clean the pores of sebum. On the first few uses, the precision care product may cause a little redness and a tingling sensation, which is completely normal, but when you include the product in your daily routine - you will soon notice that the redness no longer occurs because your skin is used to the product.