Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your health query and can very well understand your health concerns..
As per your complain it seems that you had an
allergic reaction to some known and unknown allergens leading inflammation and swelling and grey colour of lips is due to "POST INFLAMMATORY
HYPERPIGMENTATION OF LIPS"
Chapped lips and sensitivity is also due to it..
-I would suggest you to apply Petroleum jelly or beeswax containing lip balms as it helps in lubrication of lips and locks moisture..
-Apply
Hydroquinone and Kojic acid(mushroom extract) containing creams as they help in lightening the lips..
-If you use lipsticks use
Vitamin E containing lipsticks..
-Apply cold packs over lips as they help in improving blood circulation of lips..
-Exfoliate your lips atleast twice a week using a natural scrub like oats mixed with honey, rubbing lemon with salt etc..
-Always apply a SPF 15 containing lip balm when going into sun..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora..