Вена під шкірою.

No. Here вена means vein.

It is capitalized only because it is the first word of the sentence. The city Vienna in Ukrainian is Відень, not Вена.

Because it starts the sentence.

In Ukrainian, common nouns are capitalized at the beginning of a sentence just like in English. So Вена here is simply вена written with a capital letter.

Ukrainian often allows short verbless sentences, especially in:

• captions
• labels
• descriptions
• brief observations

So Вена під шкірою is a natural compact phrase meaning something like A vein under the skin or The vein is under the skin, depending on context.

A fuller version could be:

• Це вена під шкірою. = This is a vein under the skin.

Шкірою is the instrumental singular form of шкіра (skin).

It appears in the instrumental because the preposition під (under) takes:

• instrumental for location: under, beneath
• accusative for movement toward a position under something

So:

• під шкірою = under the skin (location)
• під шкіру = under the skin (movement, e.g. injected under the skin)

The dictionary form is шкіра.

So the forms here are:

• шкіра = skin
• під шкірою = under the skin

This is a useful pattern to remember for feminine nouns in the instrumental singular.

Not in this sentence, if you mean simple location.

Use:

• під шкірою = under the skin as a location
• під шкіру = under the skin as a direction/destination

For example:

• Вена під шкірою. = The vein is under the skin.
• Укол зробили під шкіру. = The injection was given under the skin.

Ukrainian has no articles like a or the.

So Вена can mean:

• a vein
• the vein

Context tells you which one is meant. In a short isolated phrase like this, English might translate it either way depending on the situation.

The stress is:

• ве́на
• шкі́рою

A rough English-style pronunciation guide is:

VE-na pid SHKEE-ro-yu

A few quick notes:

• і sounds like ee in see
• ю here sounds roughly like yu
• під is pronounced roughly like pid

Ukrainian word order is fairly flexible, but the neutral version here is Вена під шкірою.

Під шкірою вена is possible, but it sounds more marked or stylistic, as if you are emphasizing the location first.

So for a simple neutral statement or label, Вена під шкірою is the best choice.

Вена is a feminine noun.

Its basic forms are:

• singular: вена
• plural: вени

That matters because adjectives and past-tense verbs would agree with it in the feminine singular when needed.