Allergic reactions– a certain number of people are sensitive to skin lightening pills thus exhibiting rashes and swelling as well. You should stop using the product if this happens to you and immediately consult a physician.
Could lead to liver damage. Continuous use of pills overloads the liver and this impairs its normal functioning.
Symptoms such as insomnia, nausea, vomiting, indigestion, headaches could at times rise, this could be stressful to the body.
The ingredients used could cancerous. Most skin lightening pills have an ingredient called hydroquinone, which studies shows it has correlation to cancer.
Use of the pills generally inhibits production of melanin, which means it could possibly leave spots.