It is not recommended to continue drinking milk powder with a rash. Rash from drinking milk powder is suspected to be allergic to milk powder and other dairy products. Milk powder is different from breast milk, the proteins in it are derived from other species, which can be used as allergens to cause an allergic reaction in the body, which can lead to a rash. When the allergic substances in milk powder enter the body, they bind to the corresponding antibodies adsorbed on the cell surface, causing the said cells to release substances such as histamine, which leads to dilation of capillaries and increased permeability of the blood vessel walls. When the above reaction occurs on the skin, redness, swelling and hives appear. If you come into contact with milk powder or other milk products afterwards, you may still experience a rash. If you develop a rash after drinking milk powder, it is recommended that you go to a regular hospital in time for treatment.