Your lower gums have been of the same color and nature from starting or have they started appearing like this from few months or years like this ? if they are from starting like this, they cant be pathological, so nothing to worry about. but if they have recently appeared like this , then it can be due to gingivitis
or some blood disorder or due to some drug reaction. if so id the case , then go for a oral check up to your nearest dentist
and rule out all possibilites. if its the gingivitis or perodontitis, scaling ( cleaning of teeth ) will help, if required gum surgery can be done also. if other reasons, then you have to go for their treatment. if its just from starting and you want them removed for esthetic purposes, go for laser treatment
and your gums will be normal in no time.
wishing you good health
with best regards