Certain Emojis, especially those depicting hand gestures, support a variety of different skin tones, which are configured on a per-Emoji basis. If you’ve never set a skin tone for a particular Emoji before, then you’re likely to encounter the interface shown above when tapping on it.
While there’s nothing wrong with choosing a skin tone for your Emojis, it’s rather annoying how iOS asks you to select a skin tone for each Emoji individually instead of remembering your choice for all of them. Fortunately, a new free jailbreak tweak dubbed NoMoreSkinToneSuggestion by iOS developer A_H_Rabie prevents iOS from asking about skin tones once and for all.