It is possible that your little daughter has a common skin problem seen in children called 'papular urticaria' This is usually due to an allergy to sand flea bites.However it is not typical of papular urticiaria to leave a black spot as you describe here.Another possibility is that she is having a reaction to sunlight which is known as 'photosensitivity' Children who are diagnosed as having photosensitivity should also be tested for an inherited illness called 'porphyria' It is important for your daughter to be seen and diagnosed by a dermatologist.In the meantime you can read more about all of these skin conditions on Google and also look at the pictures.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.