White patches due to hydroquinone use. How much time will this take to resolve? (Photo)

This presentation is consistent with a common side effect of hydroquinone known as hypopigmentation, which can cause the skin to lighten beyond the desired effect, resulting in white patches. The associated mild burning and itching are also common side effects of this medication.

The timeline for the resolution of these white patches can vary greatly from patient to patient. Generally, once the use of hydroquinone is discontinued, normal skin pigmentation may gradually return. This process could take several weeks to months, depending on the depth and extent of the hypopigmentation.

For the burning and itching, you could be advised to discontinue the medication and apply a mild, over-the-counter topical corticosteroid or a soothing moisturizer. If the irritation persists, it would be advisable to schedule a follow-up visit.

It's also important to remind you to avoid sun exposure as much as possible during the healing process, as this can exacerbate the hypopigmentation and delay the return to normal skin color. Using a broad-spectrum sunscreen with an SPF of at least 30 is recommended when sun exposure cannot be avoided.

Please note that this is general advice and may need to be tailored to the patient's individual circumstances. It could be beneficial to refer the patient to a dermatologist for further evaluation and treatment, if necessary.