Hello,
Yes it can be due to nutritional deficiencies but you need to share pictures as well as detailed history like menstrual history, any other symptoms, history of taking any medication, history of prolonged illness.
For your 8 mths old baby, again you need to share a picture as it can also due to trauma or fungal infection which has to be treated as soon as possible
Next Steps
Consult me via practo PR to know more about your condition and treatment plan