Your daughter may have a rash in her armpits such as eczema. If she does not have a rash it may simply be a reaction to the heat. The recurrent mouth ulcers you mention in both your children is known as RAS or recurrent aphthous ulcers [read more in Google]. The cause is unknown but the ulcers are rather painful and very unpleasant. It is importnat to change their brand of toothpaste as in some cases the problem is due to a sensitivity to certain ingredients in toothpastes. It also helps to take Multivitamins with iron every day [speak to your pharmacist] An antibacterial mouthwash used daily is also advised.
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