This is a highly specific and critical transit warning from Dr. Rishi Rohit Sharma.
Mercury (Budh) rules the skin, the nervous system, and the face. The 1st house (Lagan) represents the physical head and appearance.
When Mercury transits through your 1st house, your facial skin becomes extremely sensitive to chemicals and artificial treatments. If you get a facial, bleaching, or harsh skin treatment during this specific transit ("bhoolkar bhi facial na karwaye"), it will severely backfire. You will suffer from terrible acne, allergic reactions, or permanent skin damage. Always check your transits before visiting the salon!