HQ side effect. Hq? or as normal as pih?

I have used a hydroquinone 2% (without sunscreen) topical for treating a dark spot on my nose for about 26 days, during its use i feel little stinging, irritation and reddening (but not much). After 26 days that spot has almost gone but as i also get a small amout of topical on the side area of nose, it irritates the side area of nose which started to turn darker...Now it has been around 1 month since i discontinued the use but that spot has also come and the irritated area and the whole area where i used it is more hyperpigmented (black discoloration), especially the side area of nose...What is it? Is it a common hyperpigmentation which goes away on its own with time?Is it ochronosis which usually develops after chronic use of HQ??Or as normal as PIH??