Hello ma'am...in summer I am going for walk so the blackness comes in neck line and open area s but in winters it disappeared......due to cover whole body with sweaters and jackets.....I am also checking sugar levels....fasting always below 100, BP 110/65 ....In my case it is due to heat or any other reason......kindly suggest me ..... thank you ..very much ma'am if you revert me back......I am from uttar pradesh
