Hello and welcome to HCM,
The presence of reddish spots on the lower back which hurt on touching can be due to a number of causes.
What does the lesion look like?
Is it raised or flat?
A raised lesion raises the possibility of boil, folliculitis
, or some insect bite.
A clinical examination is required.
However, don;t touch the lesion repeatedly as it can cause infection of the lesion.
A pain in the back on making the chin touch her chest can be due to the stretching causing the pain.
If the lesion is due to infection, antibiotic needs to be taken.
However, clinical examination is needs to be done before starting any treatment.
Thanks and take care
DR Shailja P Wahal