It is permissible as it doesn’t affect fasting.

Is putting henna during fasting allowed?

Fasting | March 30, 2014 5:53 pm
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Some people specify the 15th of Shaaban with some prayers, fasting and suplications, what is the correct position about this please?
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Please tell me that if a women miss the fast because of the menses should she make it up or it is exempted