A white patch on the forehead that appeared after applying a substance (like tika or cream) and is now spreading could be due to chemical leukoderma, contact depigmentation, or early vitiligo. Sometimes certain substances such as chemicals, perfumes, dyes, or sulfur-containing products can trigger loss of pigmentation in susceptible individuals.
Since you mentioned that a similar issue occurred in the past and it is increasing in size now, it is important to get it examined properly. Early evaluation helps to confirm the exact cause and start treatment early, which improves the chances of repigmentation and stopping further spread.
Next Steps
A dermatologist examination with dermoscopy or Wood’s lamp may be required to confirm whether it is chemical leukoderma or vitiligo. Based on the diagnosis, treatment such as topical medicines or light therapy may be advised.
You may consult me online with a clear photo of the lesion for a better assessment and guidance on the appropriate treatment.
Health Tips
Early treatment usually gives very good results in facial white patches, so it is better to address it as soon as possible.