Few days back I bought a discover pilgrim's redensyl and anagin hair serum.and day before yesterday I give it a tr I have only used quite few drops on hair and massaged it well.as per the direction of the bottle I leaved it overnight.next day when I woke up I got itching in my hair all I can do was only to scratch to stop the itching. today also when I worked up in the morning I feel the same itchiness although I didn't apply the serum after use.so it good to continue that serum for my hair?