Some studies have shown that many seaweed plants are acne-causing and irritating. The high content of iodine may cause skin irritation and penetrate into the pores to accelerate the growth of micro-comedones. In any case, since there are so many types of seaweed and many of them are highly processed in cosmetics, it is impossible to generalize at present, but if you are in a state of sensitive or acne skin, it is recommended to choose products containing algae carefully.