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Unlikely to be a capacitor and the battery (a cell) is large and flat behind the screen. Bumps on frame can't be something under the screen.
Do you mean the rear of the case, the side of the case or the front bezel?
I've not taken apart a Clara HD but have taken apart:
Story Cover (not HD). No isolation between cell and screen. Expanding cell cracked the screen. Badly designed chassis.
Kindle DXG: Only keyboard parts at front.
Kindle Keyboard 3: Only keyboard parts at front.
Kobo Aura H2O original: Chassis Alloy plate separates battery and screen.
Kobo Libra: Chassis Alloy plate separates battery and screen. Obviously the two buttons have access to bezel.
The only part that could swell in any of them is the cell and apart from the iRiver Story, that couldn't damage anything and is against the rear cover. You'd not get on or two bumps.
Numerous phones and tablets. None had anything that could swell other than the cell, which at worst would swell the rear of case and nothing to make bumps.
Some tablets and ereaders are similar construction apart from the screen technology and added camera(s) and microphone(s). The eInk models with speakers use a similar arrangement/construction for that as tablets. The Kobo Aura H2O original even uses the same lithium cell pack as a 7" tablet I disassembled due to smashed touch screen layer glass. Oddly the LCD screen wasn't damaged.
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