In general, when used as recommended, the amount of dye that is absorbed by the healthy skin of the scalp is small and is not expected to cause problems in a pregnancy. However hair products made outside of the US might have dangerous substances or contaminants such as heavy metals, including lead, cadmium, nickel, arsenic or mercury. So it may be best to avoid beauty products made in other countries. Gloves should be worn to protect the skin on your hands, although this does not protect the scalp, neck, forehead, ears, and eyelids. If a temporary dye gets into your eyes, minor irritation is expected. For semi-permanent and permanent dyes, effects on the eyes can be more serious, which is why it is recommended that these products are not to be used to dye eyebrows or eyelashes. If eaten (ingested), effects can be minor irritation of the mouth, nausea, vomiting, allergic reactions, and possibly chemical burns. It’s best to keep these (and all) products out of the reach of children, and to wash any areas of the skin where dye was present.