Hi, Welcome to health care magic, This reddish discoloration like bruises over skin of face and legs could be due to eczema,allergic hives,atopic dermatitis etc. More than any other field, in dermatology one needs to inspect with eyes what the skin condition is,how it looks,how is that redness or itching etc. The important thing is to diagnose first rather than treatment. You can go to skin specialist for detailed history of your grand daughters and inspection of these reddish bruises or rashes to have a clear diagnosis. They might require topical corticosteroid like beclomethasone, clobetasol or mometasome with antifungal cream like miconazole or itraconazole with antihistamines orally . Some time oral antifungal once dosage with prednisolone are also effective. So,you must take them to the doctor.