<s>[INST] Hi my son now 3 years old his lips have been turning black n dark everyday including his gum which has changed totally black. 2 weeks ago he was taking Augmenting for 5 days because he had tonsils. Could it be a side effect? or is my child suffering from something else? [/INST] HI..augmentin cannot cause this. This is not a usual side effect of this drug. But sudden darkening of gums and lips. could be due to labial melanotic macules. I suggest you consult your dermatologist for this.Regards - Dr. Sumanth </s>