Hi..
Welcome to HEALTHCARE MAGIC..
As per your complain white sore bumps over the lips can be due to viral infection causing cold sores, it can be inflamed and enlarged sebaceous glands,
bug bite,
allergic reaction to any lip cosmetic or food or medicine or due to bacterial infection.
The exact cause can be ruled out only after a thorough clinical evaluation and investigations if required..
The other part of the question is a swelling under the jaw, it can be due to two main causes:
1. Swollen
salivary gland due to blocked duct of salivary gland or can be due to infection in the salivary gland..
2. Other cause can be
swollen lymph nodes secondary to infection in head and neck region or can also be due to malignancy causing
Lymphoma..
It does not seems to be related to the lip bumps and you need a thorough evaluation with an Oral Physician to rule out the cause. In case if it is a swollen salivary gland a Cross sectional x-ray or an MRI can help in ruling out the cause..
In case of lymph nodes FNAC/ Biopsy can be advised..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora.